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29 March 2024
 
  » arxiv » cond-mat/0001164

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Adhesion-Induced Lateral Phase Separation in Membranes
Shigeyuki Komura ; David Andelman ;
Date 12 Dec 1999
Journal Eur. Phys. J. E 3, 259 (2000)
Subject Soft Condensed Matter; Statistical Mechanics; Biological Physics | cond-mat.soft cond-mat.stat-mech physics.bio-ph
AffiliationKyushu Inst. of Technology, Japan), David Andelman (Tel Aviv Univ., Israel
AbstractAdhesion between membranes is studied using a phenomenological model, where the inter-membrane distance is coupled to the concentration of sticker molecules on the membranes. The model applies to both for adhesion of two flexible membranes and to adhesion of one flexible membrane onto a second membrane supported on a solid substrate. We mainly consider the case where the sticker molecules form bridges and adhere directly to both membranes. The calculated mean-field phase diagrams show an upward shift of the transition temperature indicating that the lateral phase separation in the membrane is enhanced due to the coupling effect. Hence the possibility of adhesion-induced lateral phase separation is predicted. For a particular choice of the parameters, the model exhibits a tricritical behavior. We also discuss the non-monotonous shape of the inter-membrane distance occurring when the lateral phase separation takes place. The inter-membrane distance relaxes to the bulk values with two symmetric overshoots. Adhesion mediated by other types of stickers is also considered.
Source arXiv, cond-mat/0001164
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